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Computing long term orbit and clock models with variable time-horizons

a clock model and long-term orbit technology, applied in the field of global navigation satellite system (gnss) receivers, can solve the problems of less accurate, the accuracy of the worst-case satellite clock model is much more than the orbit accuracy, and the accuracy of the worst-case clock model of ultra-rapid orbits is many times worse than the quoted accuracy. to achieve the effect of improving the accuracy of the orbit and clock model

Active Publication Date: 2008-01-31
AVAGO TECH INT SALES PTE LTD
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  • Abstract
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  • Claims
  • Application Information

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Benefits of technology

[0015] The present invention is a method and apparatus for determining long term orbit (LTO) models using variable time-horizons to improve the orbit and clock model accuracy. The present invention produces an orbit parameter prediction model (an LTO model) for at least one satellite. The parameter predicted by the model is compared to an orbit parameter of a current broadcast ephemeris. The result of the comparison (an indicia of model accuracy) is used to establish a time-horizon for the orbit parameter prediction model for that particular satellite. The time-horizon defines a period of time in which the orbit parameter prediction model is accurate. Such a time-horizon may be separately established in this manner for each satellite within a satellite constellation.

Problems solved by technology

It has been found that the longer into the future the LTO is used, the less accurate it becomes.
In particular, the worst case satellite clock model can be incorrect by much more than the orbit accuracy.
However, the worst case clock accuracy of the “Ultra Rapid Orbits” is many times worse than the quoted accuracy.

Method used

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  • Computing long term orbit and clock models with variable time-horizons
  • Computing long term orbit and clock models with variable time-horizons
  • Computing long term orbit and clock models with variable time-horizons

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Embodiment Construction

[0022]FIG. 3 depicts a computer system 300 used for creating long term orbit (LTO) models using variable time horizons in accordance with the present invention. The computer system 300 comprises a central processing unit (CPU) 302, support circuits 304 and memory 306. The processor 302 may be one or more commercially available microprocessors or microcontrollers. The support circuits 304 comprise well-known circuits used to facilitate operation of the CPU 302 including, but not limited to, cache, clock circuits, power supplies, input / output circuits, and the like. The memory 306 comprises one or more digital storage circuits or devices including, but not limited to, random access memory, read only memory, optical memory, disk drives, removable storage, and the like. The memory 306 stores LTO software 308 that, when executed by the CPU 302, causes the CPU 302 to perform a method of generating at least one LTO model in accordance with the present invention. The LTO software 308 compri...

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Abstract

A method and apparatus for determining long term orbit (LTO) models using variable time-horizons to improve the orbit and clock model accuracy. The method and apparatus use either historic ephemeris or historic measurements for at least one satellite to produce an orbit parameter prediction model (an LTO model). The parameter predicted by the model is compared to an orbit parameter of a current broadcast ephemeris. The result of the comparison (an indicia of accuracy for the model) is used to establish a time-horizon for the orbit parameter prediction model for that particular satellite. Such a time-horizon may be established in this manner for each satellite within a satellite constellation.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims benefit of U.S. provisional patent application Ser. No. 60 / 765,925, filed Feb. 7, 2006, which is herein incorporated by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention generally relates to global navigation satellite system (GNSS) receivers and, more particularly, to a method and apparatus for generating long term orbit (LTO) models used by assisted GNSS receivers. [0004] 2. Description of the Related Art [0005] Global Navigation Satellite System (GNSS) receivers require satellite navigation data in order to compute pseudo-ranges to the satellites of the GNSS system and, in turn, compute a position of the GNSS receiver. GNSS include such systems as GPS, GLONASS, and GALILEO. The satellite navigation data (i.e., commonly referred to as ephemeris) comprises both satellite orbits and clock models. Traditionally, GNSS receivers have decoded this navigation data from...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01S5/14H04B7/185G01S19/05G01S19/27
CPCG01S19/05G01S19/27G01S19/258G01C21/20
Inventor DIGGELEN, FRANK VANRIBEN, MATTHEW
Owner AVAGO TECH INT SALES PTE LTD
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